GREENHOUSE GAS EMISSIONS FROM SOIL IN DIFFERENT LAND USES AND MANAGEMENT IN THE BRAZILIAN SAVANNA

Ana Luisa Soares Vasconcelos, Marisa de Cássia Piccolo, Gregori da Encarnação Ferrão, Marcos Siqueira Neto

Resumo


Agricultural soils are an important greenhouse gas (GHG) source. In this study, we assess the GHG fluxes from soil under different land use and management in the most important grains producing region in Cerrado biome. So, our objective was quantifying the GHG fluxes (CO2, CH4 and N2O) to verify the existence of relationships between these gases and obtain estimation of GHG fluxes through statistically correlation in Brazilian Savanna. GHG flux was measured in areas under i) native vegetation (NV), a grassy pasture (GP), a conventional-tillage (CT), and three areas under no-tillage (NT) with different crop succession. The results showed highest CO2 emission in GP (135 mg m-2 h-1), while in CT verified lower emission (69 mg m-2 h-1). CH4 fluxes showed different between land uses, in GP was found emission (32 µg m-2 h-1), while in other areas (NV, CT and NT) were observed influxes between -46 and -15 µg m-2 h-1. N2O emission was highest in NV (16 µg m-2 h-1), while lowest in the NT (11 µg m-2 h-1). The CO2 vs N2O emissions showed significant correlation (r > 0.60, p < 0.01) except in GP, as the CO2 vs CH4 in NV, CT and NT (r > 0.55, p < 0.05) and, CH4 vs N2O in NV and NT (r > 0.50, p < 0.05). These results cannot permit to identify the processes involved in the GHG correlations, but, these statistical estimative and simple equations can provide rough estimates GHG flux through a simple field measurement.


Palavras-chave


Gases do efeito estufa, plantio direto, plantio convencional, pastagem,

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Direitos autorais 2019 Revista Trópica: Ciências Agrárias e Biológicas

Licença Creative Commons
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial-SemDerivações 4.0 Internacional.

R. Tróp.: Ci. agr. biol.

ISSN 1982-4831